# structure node fix command

Syntax

structure node fix keyword ... <range>

Primary keywords:

Fix conditions for all nodes in the range, thereby preventing these values from changing. If any translational/rotational velocity component is fixed, then all three components of the translational/rotational velocity should also be specified in the local coordinate system via the structure node initialize command. If a fixed displacement is required, the appropriate velocities should be initialized to zero. Degrees-of-freedom with a rigid attachment condition cannot be fixed; the rigid condition overrides the fix condition.

rotation

rotational velocity in all three degrees-of-freedom (node local system)

rotation-x

rotational velocity about $$x$$-axis (node-local system)

rotation-y

rotational velocity about $$y$$-axis (node-local system)

rotation-z

rotational velocity about $$z$$-axis (node-local system)

system-local

inhibits automatic updating of the node-local system based on the elements that use the node. The default behavior is free.

velocity

translational velocity in all three degrees-of-freedom (node local system)

velocity-x

translational velocity in $$x$$-direction (node-local system)

velocity-y

translational velocity in $$y$$-direction (node-local system)

velocity-z

translational velocity in $$z$$-direction (node-local system)